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| All Patents in class 204/242 | |||||
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| Number | Date | Patentee | Title | Type | |
| 52,450 | Feb. 06, 1866 | J. Russell | Process of Hardening Files | files | |
| 742,131 | Oct. 20, 1903 | C.T. Pratt | Apparatus for electroplating | ||
| 3,432,420 | Mar. 11, 1969 | P. Pan | Electrolytic Cell Assemblies | electrolysis apparatus | |